Lumber-driver s calk



UNITED STATES PATENT OFFICEO iYRUs M. BAKEB, OF BINGHAM, MAINE.

LUM BER-DRIVER 'S CALK.

SPECIFICATION forming part of Letters Patent No. 230,686, dated August 3,-1880.

Application filed. June 17, 1880. (No model.)

To all whom it may cmcern:

Be it known that I, CYRUS M. BAKER. of Binghau. in 'the county of Somerset, in the State of Maine, huve invented zt new and useful Improvement on Lumber-Drivefis Czilk; V

* or wherever a sure footing is necessary.

The invention consists iu u call( having a, steel center und point, but-an' exteriorhod y ot' iron.

Itfurther consists in providiugthe cztlk With e shoulder to keep it. from dropping out and u fiunge to prevent it from being driven too fur into the boot'.

ln the drawings, Figure 1 represents the calk as set in the sole ot' u boot ;'1 `ig. 2, u View in perspective, and Fig. 3 e View in section.

'l he center of the call; and both euds ot'it are construeted ot' steel.. It ismude of steel for its entire length. Exeept at the extreme ends of the ctlk,'t is covered with ironm. Above the point a is a flange, 0', to prevent it froni being driven too far into the leather.

Between the flu nge and the ini er 01' upper end ot' the calk is a shoulder s, to prevent the call; from d'ro 'iping out of the boot if the l'eather shrinks about the calk.

When this call( is formed under the hitinner or hy other means ot'conpression the iron and steel ure druwn unifornly to u point together. The steel po''lion cun thus he nmde Very hard without danger ot' breaking it as it is surrouded und supported hy the iron.

The cnlk cun he made harder than it'i't were made entirely ot' steel. lt is stronger, und it will wear shui'per and hist longer from having an iron exterior.

What I claim us new, und desire to secure by Letters Patent is i l. A. call( composed of d,- steel body and point und uu eXterior surface ot' iron.

2. A call( having u, steel body and point, a fienge, o, and shoulder s, suhstantiully us described. I j

In witnesswhereof I hei'eunto set my hand, in presence ot'two uttesting witnesses,this 29th day ot' Muy, 1880.

GYEUS M. BAKER.

Witnesses:

WARREN HOLBROOK, SAM. 0. SEARLEJ 

